Installation of an oversized disc
Each unit is suitable for a certain size of grinding disc, as specified in the data sheet of the angle grinder. If “cutting disc” has a value of 125 mm, this means that 125 mm is the maximum diameter of the grinding disc that can be mounted on the unit. It often happens that the operator puts a larger disc on the angle grinder to cut thicker metal or a more oversized structure. How is that dangerous??
Firstly, if you want to use a larger disc, you have to remove the blade guard, because the disc may not fit. The operator loses protection and, if the disc is damaged, could be injured by splinters.
Secondly, it is more likely that the cutting wheel will be damaged because of the speed mismatch. Note that for each disc size there are their allowable RPM angle grinder, at which they will work: for circles up to 125 mm diameter 11000 12000 RPM, for circles up to 180 mm diameter 8000 8500 RPM, for circles up to 230 mm diameter 6700 RPM. That is, you can cut with big discs at lower speeds and with small discs at higher speeds. It is worth noting that the linear velocity of the edge of the wheel should not be more than 80 m/s, so when you increase the diameter, you need to reduce the speed. At high speeds, a large disc will fly apart, which is dangerous for the operator.
Conclusion: in no case do not exceed the maximum size of the cutting disc. If you need to cut thick metal, it is better to buy a device for large discs, for example, Zubr angle grinder-P230-2100 PV.
No TB. Death by angle grinder. 2 part
This text is a continuation of a previously published article, so before reading it, we recommend reading the first part.
In the second part, we decided to collect the most common recommendations for working with an angle grinder, which will eliminate most of the unforeseen injury hazards. Of course, experienced users with personal experience will be able to add to our list of recommendations, so if you have something to add to our collection of rules, write them in the Комментарии и мнения владельцев below this article.
We want to remind you that this article is not written for entertainment and some of the following pictures and descriptions might shock the readers, but there is no better way to prevent an injury than to know where and how you can get hurt. So we hope this article will be helpful to you.
Before we proceed directly to the list of recommendations, here is a picture with demonstration of chain saw damage statistics. In general, this picture can serve as an indirect demonstration of the most commonly injured areas of the body, t.к. The grip, posture, and type of work you do with a chainsaw and angle grinder are similar in many ways.
So, here is a list of recommendations for safe work with an angle grinder. It was compiled based on our forum threads as well as recommendations from the manufacturers of this tool. Some points in it may cause disagreement on the part of some of the readers and this is normal, t.к. There is no unambiguous answer to this question accepted by all participants of the discussion.
- Use protective equipment at work: goggles, shields, headphones, gloves.
- Have a stable body position that is comfortable for work and avoid possible body movement restrictions as much as possible.
- NEVER remove the protective cover! (There is probably no better way to protect yourself from shards of a shattered disc. Don’t reinvent the wheel, so the doctors don’t have to invent a new face for you later).
- Never use discs with incompatible diameters (especially discs with a larger diameter than the one designed for the angle grinder, i.e.к. Every type of angle grinder has the rotation speed adjusted in such a way that cutting edge contacts the material at a certain speed, depending on the disc diameter. Based on the elementary laws of physics, it is easy to understand that using a 230th disc on a 150th angle grinder is not the most adequate solution).
- Hold the tool firmly and with both hands.
- While working, do not stand on the saw blade cutting line.
- Clamp the object being worked on firmly to prevent the workpiece from flying out or shifting, which could cause the disc to jam.
- Remove all clothing that could interfere with the operation, such as hanging sleeves, wide sweaters and jackets, crosses or other jewelry hanging around the neck, long hair, ties, etc.etc In general, anything that can get in the cutting area of the blade.
- Work with sparks on yourself (there are some differences of opinion here, i.e.к. almost all angle grinders are equipped with 2-3 holes for attaching an additional handle, which means that manufacturers allow the angle grinder to work in both directions of disc rotation. Also, when working with sparks on your body, avoid direct contact with your clothes.к. there is a risk of ignition of the material).
- Continuing the previous point, let’s add that you should also not work near flammable materials: rags, rags, flammable liquids, sawdust, as well as live wires (and without).
- Do not use in your work CUSTOMED cutting discs and discs (of course, first of all, it concerns notorious discs for wood. At the moment there are several models of such discs for wood, developed and officially released by well-known tool manufacturers. For example, by Bosch (photo below). Most injuries during sawing with wood angle grinder are received just by “self-made” disks, which have worn-out alignment or cutting edge is not optimized for wood, which leads to beating while working and generally unpredictable behavior of the disk in the treated environment).
- Do not allow bystanders to be in the work area of the angle grinder, as well as behind yourself, t.к. any improper movement may cause unintentional jolting or straining of the tool’s power cord, which would result in a dangerous situation at the time of operation.
- When cutting pipes or pipelines, check them for pressure, liquids, or other foreign objects.
- Do not consume alcohol or other intoxicating substances before work. Even the most experienced craftsmen are not spared by neglecting this rule.
Off the list, let’s add a user comment on care of cutting discs.
chico63: If cutting disks (especially thin 230’s or defective ones like Chinese “Luga”) get damp in a garage, they start to “wobble” mercilessly with probable consequences on our topic. It’s necessary to dry such discs. I also sometimes put worn discs on both sides and clamp the whole package as a sanding disc. Then the basic 230 gets much stiffer and doesn’t walk around like a “rumble reed. “Well, it makes sense on 230s, on small ones, it seems, the hardness of the disk is enough always.
FURTHER IN THE ARTICLE ARE DESCRIPTIONS AND FOOTAGE OF SHOCK CONTENT. IT’S NOT RECOMMENDED FOR THE IMPRESSIONABLE!
Damage at work with an angle grinder and other tools:
Al99ex: An acquaintance got some used non-reinforced discs from a stationary angle grinder (vulcanite) somewhere, as their seating size is 32, he put up some spacers, and as these bits are larger than the cover, the cover was removed How it survived. a mystery of nature, a shrapnel stuck in a wooden door a half centimeter. I pulled the splinters out of my forehead, neck When you work with an angle grinder, you have to hold it so that your face is in the plane of the splinters’ flight.
WEREG: angle grinder without protection, what else! At our carpentry shop, guys shaped glazing beads on a stationary cutter, without tsulagi driven But it’s all for the time being, until one skin from the hand to the elbow twisted.
n-p-n: A couple of life stories. When I worked with an angle grinder for the first time in my life, I had a certain fear (not panic, but healthy fear) of cutting and fast-moving tools. But there was such a mishap. Having worked off the cut, I turned off the engine of the angle grinder and put my tired hand down with it. I touched my knee with the disc, which was spinning by inertia. The disc stopped in a couple of seconds, and neat cuts appeared on my pants and knee. Thank God it wasn’t too deep, three to five millimeters.
The second incident. When I bought an angle grinder, I deliberately went for the 125. “115” did not seem to me at all serious, and unprofitable in terms of the price of discs. And the following story is about the use of my angle grinder brush. After I mounted the brush on the angle grinder I found out that the cover was not covering it (the brush is cone-shaped and sticking out sideways).) Well, it’s OK, I guess, it’s not a disk after all. Anyway, the steel hairs from the brush flew out and screwed into the surroundings, including my legs and arms, like arrowheads from a shrapnel ammunition.
And finally, an absolutely wild case, in which the tragedy could have been avoided, if at least the rescuers took elementary steps to save a colleague.
Angel.: Case of an electric shock. We decided to follow the instructions and give first aid. And the manual says to give CPR and indirect heart massage. We did not dare to kiss; we took off the oxygen hose and put it in our mouths. Pressure, pressure There is one mistake, which unfortunately is also made by doctors. Welders are excused. Doctors aren’t. This kind of ventilation gives the lungs dry 99% oxygen, which takes away moisture and burns the lungs. In the ICU, oxygen is properly hydrated, and wet doesn’t burn. They first started the heart, the moisture evaporated, and it started to burn, there was nothing to breathe, they gave him more oxygen, a vicious circle. A day later, the electrician died of asphyxiation in the emergency room.
We hope none of this ever happens to you. Work with pleasure and without injury!
Stay safe and stay healthy!
The other points make perfect sense. This one could be nothing more than stolen harmful advice based on nothing more than widespread prejudice. Some bald YouTube guru with the aplomb of a video opinion. The emotionally compelling message was picked up by the masses. And go.
Manufacturers, with the enviable persistence of making tools with the ability to rearrange the handle, that’s not the only thing that’s wary.
Here’s an example: if sparks are flying at the operator, where should the disk splinters and chips of material fly?? In the same direction as the sparks. Т.е., on the operator. If the cutter bar is at ground/floor level, at the feet of the. If the cut is made at an inclination (of the tool relative to the mowing line, e. g., standing in a half-crouch), then in the groin and above (the shoulders face). Most of the scary pictures here are just about the splinters of cheap or generally left-handed (for dr. tool) discs stuck in different parts of the body of the TB violators or bystanders standing where they shouldn’t.
Or, here is the first picture in the article: an infographic with statistics about the body parts that have been hit:
Of course, this is not a statistic for an angle grinder. But, if you consider that the work with the tool is similar, as the author claims, then it turns out that the lesions are characteristic of working in the “right stand” (tool on the left, left hand on the start button, left foot behind the tool in the plane of the cut. you shouldn’t do that, but it’s more convenient) “sparks on themselves”. Working body (saw chain or disk) is destroyed, splinters fly to the operator, most of the damage is to legs, a little less to shoulder and head. The injuries were mainly on the left side. How else to explain this nature of injuries, except for the characteristic stance and the “splinters on themselves”?
Or, here’s another eloquent example. Another picture in the article: a man with a whole angle grinder in his belly.
If I’m not confused, this man was working “sparks to himself” (if you look at the disc from the clamping nut side, its direction of rotation is counterclockwise, if memory serves). How did the angle grinder hit him in the stomach?? One could imagine it easily: the blade got jammed and the instrument twisted out of the operator’s hands, turning the cutting part upward, with the casing downward. The man lost his balance as a result of this sambo technique and fell on the disc, which had not had time to stop. This would not happen with “sparks on themselves”.
You can continue. Throw in a couple of scary examples from life about sparks and dross. But I think that’s enough food for thought.
In general, if these two rules are followed:
It doesn’t matter where the sparks go. In any case, everything that flies away will miss you. And if a tool flies out of your hands, it is in itself an emergency. You’re not in a flying circus, but at a construction site, and construction site is the same as war. Letting a tool out of your hands or not controlling it is the same as dropping a grenade into your pants when you toss it. You’d better go bake pies, then.
The important thing is in what direction the tool “kicks” from the material. The disk should “roll” on the material. You should cut smoothly, without violence and haste, “stroking”. Then nothing will jam, nothing will fly away. If the sparks are under you, start cutting from the side closest to you. If it’s from you, it’s from the far side. Otherwise fraught with surprises, and generally speaking inconvenient. Everyone understands it intuitively after working a bit.
This is not a fact at all. It is more the other way round than the other way round!
For example: the worker is cutting through a strip of sheet metal (or other materials) in the direction of the abdomen. material) in the vice horizontally, the part that sticks out of the vice jaws on the right. The left handle of the angle grinder points toward the worker’s abdomen, the angle grinder’s motor housing points to the right of the worker, “sparks away. It seems to be convenient to work and sparks don’t interfere Only extended left hand (and right hand too) don’t control angle grinder well. force of recoil of angle grinder is directed to worker, and feed of angle grinder practically falls across his hands (very unstable). ). Trying to compensate instability, the employee is displaced to the left (bending left hand) and the angle grinder turns in hands at possible bite of a disk and simultaneously throws it towards the employee The right side of jaws of a vice is also a guide for the angle grinder to fly at the employee, instead of to the left of him All this occurs almost instantly and no “firmly hold in hands” will roll here. A possible safe option in such conditions is to stand much to the right of the vise, so that the angle grinder flew to the left of the worker in case of possible disc jamming and kickback. (it is more convenient to make long cuts with periodic sheet reclamping). Still it is possible to clamp the plate so that to cut to the left of vice’s jaws, thus to stand considerably to the left of the vice. the sparks fly to the right of the employee, and the angle grinder in case of what it is more convenient to make not deep cuts of rigid plate not further from the stop of the plate end in the reduction gear of angle grinder, and of non-rigid plate without deepening, at long cutting there will be a danger of material undermining with the subsequent avalanche deepening of disk in the cut).
Another possible version of the injury described above: standing in front of a vice or riser or a road sign and cutting vertical pipe, angle, etc. horizontal cut “with sparks away from you” at the level of your belly, i.e. going deeper into the tube (or other pipes) and into the pipe.) from its right (from the employee) side, the rotating disk just pushes the angle grinder on the employee and when bite it turns the angle grinder counterclockwise, and you can not hold it. Why so? Yes, because vertically standing structures in most cases can be attributed to “stressed structures”, because even their own weight can strongly clamp the disk when deepening into the cut. And if it is a water riser. it is definitely a “tense structure”, and if in cramped conditions, it is generally possible “ricochet” angle grinder on what is to the left of the pipe with the arrival of the worker.
What to do? As a minimum:. stand to the right of the place of cutting, and that the sparks go a little to the right of you! The effort to hold an angle grinder should not work in the recoil sector and across the feed (very unreasonable. ). It’s better when the sum of these forces is directed a little bit to the extension of the arms, rather than pushing into the arms. (by analogy. it is possible to hang on hands for a long time, but to keep your weight on outstretched hands). Try to cut with the minimum penetration of the blade into the material, and if this is not possible, then take measures against sticking of the blade, for example, alternately deepen and widen the kerf by 2 thicknesses of the blade and/or make sure that at the end of the cut the construction with its own weight does not clamp the blade and ask an assistant to hold/bend the upper end of the construction in the direction of widening the kerf, etc.д.
Cutting tight structures, especially in cramped conditions, is a song of a lifetime! If at all possible, it is often better to change the tool to an autogenous, electric welder or sabre saw (hand saw, etc.).д.) If it is all the same angle grinder, then, for example cut the old pipes in the apartment safer when cutting them at 45 degrees to the axis of the pipe (with all the conditions that are listed above). So at least there will not be a direct splinter between their faces, but a tangential splinter, which is much weaker.
About allegedly safe cutting of sheet metal “by sparks from yourself”, starting from the far side of the sheet: There will be no pulling of the blade into the cut, but otherwise the same mistakes. For example at floor level:. hands work in the sector at the stop / across the hands, and the employee does not want to stand on a possible way of the angle grinder, so stands outside the cutting plane. extremely precarious position!. The angle grinder is flying towards the worker. Ask why into the worker and not past? And because the worker will not be able to hold the angle grinder at an angle to the direction of the stop in his hands for a long time and will start to put himself in the plane of the cut and in the path of the angle grinder Once, when my staff cut a lot of slate, then cut his sheets at ground level in the direction from left to right, sparks dust to the left. and the dust is not flying at the employee, and the body is covered by the gearbox, and the hands are not as tired, and the angle grinder in case what is not flying at the employee.
You can’t always do that and it’s unlikely you’ll be able to work like that for a long time.
I used to have to work with one hand at the body shop, and I still do it sometimes. And I can hardly cut a few meters of a sheet of ten iron without standing in a mowing line too. About twenty years ago, when there were no disks F230 with thickness less than 4.0mm, the most productive and less tedious method of cutting the sheet was the following: I cut from the edge from myself, the sparks go conditionally “towards myself” between my legs under the sheet. I begin to cut with two hands until the depth of the disk with landing gear of the angle grinder on the sheet. The hood of the angle grinder also practically lies on the sheet. While doing this I see the very edge of the disk from the opposite side of me and aim at the mowing line of the marking. Further it is already possible without the big efforts to hold the angle grinder by the handle with a button even with one hand and to move on a sheet up to full wear of a disk Further replacement of a disk, entering into the cut with holding the angle grinder with two hands up to the landing of the reducer on a sheet, and so on to the victory. With today’s thin discs of course unequivocally already can not work so, and it is dangerous, you have to operate with two hands and a shallow plunge disk. But it is definitely not necessary to drive thick metal over its entire length to a part of the depth for the marking of the mowing line of the cut, and then try to cut through this curve of the mark completely. discs even bend in the arc and crunch / crumble and motor angle grinder sits on the revolutions from the curve marking. It’s better to make a shallow notch and immediately cut through to the full depth, to make a shallow notch and immediately cut through, and so on until the end of the cut. Periodic cutting of a short outline doesn’t let the disc bend into an arc, unlike cutting of a long outline, and it’s better to keep the straightness of cut. Sincerely! and no offense!
Which direction is better and safer to cut with an angle grinder
Today I would like to talk about in what direction should the cutting wheel of angle grinder turn, on itself or on itself? I was inspired to write this article one man who decided to teach me how to cut with an angle grinder, and we ended up having a little argument with him.
We were working on a project, we were doing metal heating, I went to cut a piece of pipe. Usually, the angle grinder cut to himself (the sparks under himself), this man worked at the same facility, paving the roof, came up to me and almost an orderly tone advised to change the direction of rotation of the circle from himself. I asked him why I should do it, but he didn’t give me any arguments other than the right thing to do. Of course we started to argue, but we did not come to a consensus.
What is the right thing to do?
In this regard, I have not found specific rules, and so everyone must choose in what direction should the sparks fly, because it is no wonder the manufacturer makes the design of the angle grinder in such a way that the direction can be changed independently. But from experience, I will express my thoughts and tell you what I have come to in terms of safety and convenience of using this tool for 15 years.
Let’s consider the variant when the direction of the sparks carried out from itself:
For me personally it is hard enough to work with a tool in this position. the angle grinder should be kept as much as possible perpendicular to the surface, if the disk is shifted back a little, the tool can easily tear out of his hands. Sparks, under certain conditions, fly right in the face, and if the disk is flying around, you may lose your eyes.
In this position the disk is jammed more often, the tool is very unstable, and it seems to me that it is much easier and more convenient to pull it towards yourself than to push it forward. In general, for me, this way is extremely uncomfortable and not safe.
Now consider the option of sparks flying at or under yourself:
This position is much more comfortable for me personally. The tool is more stable and controllable, even if it blows out, it flies forward and you have time to react and hold it. Sparks don’t fly in the eyes, and again, if the disk breaks, the debris will fly under your feet. And in general, I think you can not think of a more convenient position.
By the way, many did not know that the drive rotation position can be changed, all you need to do is to twist the knob and the button, as well as move the protective casing to the other side.
Safe work with an angle grinder
( It will be trouble). I’m not going to be right, but I would NEVER HOLD IT OTHER, NEVER.
lamplighter: Put a disk right.With the label facing inwards.
Paws of the Kremlin: Who says that sparks do not burn in the “away from you” position, let them try to saw off a stuck bolt under the bottom of the car. Or, try to imagine that you, a small angle grinder, are sawing a part with one hand. You are safer with the sparks pointing toward you or vice versa?
Alex Salo: A Khohol should not use a Russian angle grinder.
Andrey Porokhnya: And if you tear the disk, it will fly at you, it’s simple
Sergey Ryabchikov: First of all you have to put the disk in the right direction. Polygraphy should not be outward.
Before you start cutting material, you must understand in which direction the sander should rotate: sparks from yourself or from yourself. There is no uniform answer among users; they work both ways. If the nozzle rotates counterclockwise, the sparks (as well as the intermittent circle) fly in the opposite direction from the operator, but the tool will return to the user during jamming. In the second case, the opposite happens. According to safety measures, it is believed that the correct rotation is when the sparks fly to the operator, because when jammed, the tool will jerk in the opposite direction.
In any case, manufacturers recommend directing the angle grinder’s motion and rotation of its wheel unilaterally. This greatly reduces the likelihood that the drive will slip out of the slot during the workflow. But with this method, the markings on the material are often hidden by flying sparks.
Changing the nozzle rotation It is possible by moving the handle and coating to the other side. This is the easiest option (if possible). A more complicated way is to make changes in the electrical circuit of the device. But this does not always work.
When cutting, it is essential that the working plane does not change, and that there is no distortion. The discs should be used in accordance with the material to be worked. Thus, concrete, tile, stone are cut with discs of different diameters with a diamond coating.
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angle grinder is in high demand for a wide range of applications. They have built an excellent reputation in demanding, heavy-duty applications. For example, when processing concrete in an atmosphere of increased formation of abrasive particles, the power tool copes with the task.
This is probably the most commonly used tool, not counting drills. angle grinder works a lot, but not everyone wonders about the correctness of the manipulation performed, in terms of personal safety and quality of work. In this article we want to introduce you to the basic intricacies of working with this tool and discuss the following issues in detail:
Before you start working, you need to prepare your angle grinder. We are talking about the choice of equipment (disk). Here are some points to keep in mind
- Disc diameter. Remember, the smaller the diameter of the disk, the more revolutions (higher rotation speed) it can handle, and vice versa.
- The choice of blade depends in the first place on the material you are going to work with and the construction of your tool.
- Pay close attention to the symbols and markings on the blade. After carefully examining them, you will understand whether the selected equipment is suitable for the intended work.
Also, always wear protective gear such as gloves, goggles, long-sleeved shirt and closed shoes.
First of all clean the workplace from unnecessary items. Securely clamp the workpiece to be machined by marking the workpiece in advance, if necessary. Getting to work.
Always hold the tool firmly and confidently with both hands. Try to keep a stable body position. Stand so that sparks do not fly on your clothes, and even more so in your face.
Always be aware of such a concept as reverse impact. This is the most dangerous thing that can happen when working with a grinder. It can happen in case the disc jams heavily in the workpiece. In such a situation, the angle grinder will backfire sharply. Oversee the process to avoid this.
Also remember that the power cord angle grinder must be insulated from sparks during operation. If you needed to move the tool to another working surface, do not forget to first turn it off, then pull the cord out of the socket. The same should be done in a situation with a power outage. As soon as the power is lost, turn off the tool, and then unplug it from the mains. If you don’t do this, when you resume power, the angle grinder will start working erratically again and can cause irreparable harm to your health, others, or damage to objects around you.
The most frequently asked question that arises among beginners is the following: How to properly cut with an angle grinder: on itself or away from yourself? Many aren’t paying much attention to this, and they shouldn’t.
The manufacturers of angle grinders advise their customers as follows: Work with the tool in such a way that the course (direction) of the cut coincides with the direction of rotation of the disc.
Angle Grinder Hack! Don’t Throw Away the old Angle Grinder!
Experienced craftsmen have a clear answer to this question: You should cut from behind. It is necessary for your safety. In case the angle grinder is ripped out of your hands, the tool will be thrown in the opposite direction from you. If you cut toward you, the tool will end up at your feet, if you get in the above-described situation. We will not describe the consequences. You can imagine them yourself.
If you are cutting parts or materials that are thick, always cut in a straight line.
If you are cutting a piece such as a corner or a profile or sectional tube that is normally quite long, cut with a hanging edge. Otherwise, if you cut in the place between the supports, it is possible that the disc will jam due to the deflection of the workpiece.
If you are cutting profiled sheeting, metal siding or metal tiles, take care to have special anti-corrosives to lubricate the material in order to avoid rusting soon.
If you are cutting paving slabs or paving stone, get a special disc with a diamond notch.
Concrete, concrete and other similar materials should be treated with special stone disks.
If you have to cut a gas or oxygen cylinder be very careful as it can explode due to traces of gas or condensate left behind. It is better not to do such work at home.
If you need to cut glass or, for example, a mirror. The most trivial ceramic disk is the best for you.
When working with a material such as wave slate, do not apply extra force to avoid chipping and bumps.
You can work on rubber with an angle grinder but it is not necessary. If you know what we mean.
Gouges, springs, rebar or channel bars can also be cut with an angle grinder.
You need to cut plasterboard or polycarbonate? Do it very carefully in order to avoid chipping and breaking of the material. You need care if you need to cut a glass mosaic. For example, if you are cutting off the excess parts of the glued arch, cover the cut and the cut part with masking tape or construction adhesive tape. This minimizes the possibility of cracks and prevents splinters from scattering on the floor after cutting.
How to cut tiles with an angle grinder WITHOUT chipping?
As we said above, the range of applications of the angle grinder is incredibly wide. It is also a great helper when cutting such a material as tile or tile. But, there is a logical question about the equipment: What is the best way to work on tiles?? To do this type of work you need to get a diamond wheel and a tile clamp. It is unlikely to work without dust with this material, so make sure you have a mask beforehand.
Let’s take a closer look at the process itself and how to cut a tile or tile without splintering.
- The easiest way is a straight cut. Secure the tile well, so that its edge remains on the weight of the cutting line and get to work.
- The next method to note is cutting at a 45॰ angle. This method is more complicated than the first one. First we cut ceramic tiles with a straight cut. Then, when cutting, angle the angle grinder disc at an angle and remove the unwanted part. Next, sand the cut with sandpaper.
To begin with, let’s talk about the dangers that lie in wait for the master when cutting metal with an angle grinder, namely:
- Disc splinters, in case it breaks;
- Powerful flow of sparks and fine abrasive particles;
- In some cases, it is impossible to hold the tool in your hands.
And now, a few recommendations for working with metal.
If you have no experience in this type of work, then, to begin with, it is worth practicing on unnecessary parts. If while working, you decide to change the plane of the cut, when the disk is inside the workpiece, it will immediately lead to its damage.
To increase the life of discs, especially expensive ones, they need to cool down. This is done with water. It is necessary to water the place of the cut. It is desirable that you work with a partner, who will carry out all these additional manipulations.
Also, to increase the life of the tool, and the tool itself will help to take 5-7 minute breaks every 20-30 minutes of work. This rule is especially important when working with domestic grinders. That way you will protect your tool from overheating.
You should also remember that you should not put pressure on the angle grinder while working, otherwise it can fail due to overheating, or the disc will jam. If you feel that the work is going too slowly, try to change the disc.
Many experienced masters argue that cutting wood with an angle grinder to be. Our opinion: it is indeed possible to cut wood with an angle grinder, but it is extremely unsafe, inconvenient, slow and of poor quality. And here’s why.
First, during operation, the disk angle grinder very heated becomes incredibly brittle. The slightest misalignment could result in the blade breaking. You can read about the consequences of this situation in the pictures on the internet.
Secondly, when you work with a disc with a tipped blade, these tips can easily get under the skin. And this is a direct path to the hospital, because you can not extract them yourself, plus all this is fraught with the risk of infection.
Thirdly, when using a disc for wood, the teeth can catch more wood than you expect, and this, in turn, leads to. that the angle grinder will simply be ripped out of your hands. This is very dangerous!
We hope we have comprehensively explained why you can not use an angle grinder during the work on wood, and you will not even try.
But, as practice shows, many craftsmen at home resort to the help of the angle grinder in the processing of materials such as particleboard, laminated particleboard, laminate, OSB board or plywood. It is necessary to saw it as carefully as possible and with observance of all safety measures. Otherwise you might not only spoil the material, but also injure yourself.
In order not to spoil the workpiece and make a quality smooth cut angle grinder you need to perform a series of preparatory steps, which we explain in this part of the article.
- Marking. Everything is brilliantly simple. First we mark, then we cut. Let’s take pipe cutting as an example. First of all use a chalk or a marker to mark the size.After that, the paper or construction adhesive tape is used. The main thing is to make sure that the edge is even. Take the selected auxiliary material and carefully wrap it around the pipe. Its edge and will be a clear and accurate marking of the cut.When performing the work, it is important to remember that under no circumstances should you change the position of the tool stroke. Otherwise it is possible that the disc will jam or break. Take, do not put additional pressure on the tool, because it immediately reflect the curvature of the cut and spoil your workpiece.
- It is very important to choose the thickness of the wheel correctly. A simple axiom applies here: the thicker the material you work with, the thicker the disc should be. When selecting accessories, seek the advice of an expert in the field and pay attention to the marking on the grinding wheel jacket.
Work with an angle grinder requires constant attention and control, because the consequences of accidents can be irreversible. Before you begin, therefore, observe the following points:
- Protect all parts of the body: face, hands, eyes.
- Keep work area clear, especially where sparks are thrown, and keep all combustible materials away.
- The workpiece to be grinded must always be securely clamped.
- Always wear a safety cover.
- Hold the tool firmly during operation.
- At the end of the work wait until the full stop of the disc rotation, put the angle grinder disc up to not damage it, unplug the tool and make sure that there is no smoke and signs of fire.
WHAT CANNOT be cut with an angle grinder? BASIC MISTAKES
The list below shows the materials with which you can work with an angle grinder. Materials that are not on the list may not be worked with.
- angle grinder perfectly cope with the cutting of materials such as cast iron, metal, steel, copper, aluminum, iron, titanium. You can cut stainless steel or galvanized.
- With the appropriate nozzles, you can also work with plastic, ceramic, glass, plexiglass and faora.
- Stone, granite, marble, asphalt, concrete or concrete wall, brick, porcelain stoneware can also be grinded with an angle grinder.
Angle grinder comes in handy if you need to cut water pipes or old heating.
One of the main factors that guarantee the quality of work is the right equipment. If you still have questions or want to buy discs, please contact our managers by phone. They will recommend suitable drives and advise you on all matters of interest.
Changing direction of rotation of asynchronous motor rotor
Asynchronous motors powered by a three-phase voltage of 380 volts are the most common in industry. In order to reverse, it is enough to change any two phases.
There is a widespread connection scheme made with two magnetic starters. Actually for DC motors it is similar, but two-pole contactors or starters are used. This scheme is also called “reversing starter circuit” or “reversing starter circuit for asynchronous three-phase electric motor”.
When KM1 starter is turned on by “Start 1” button, voltage is directly applied to the windings and “Start 2” button is blocked from accidental activation, by opening of normally closed contacts of KM-1. the motor rotates in one direction.
After KM1 has been switched off with the stop button or de-energized, KM2 can be switched on with the start 2 button. As a result, a line L2 is fed directly through the contacts, and L1 and L3 are swapped. Button “Start 1” is blocked, because the normally closed contacts of KM2 starter are set in motion and open. Motor starts to rotate in the other direction.
The circuit is still widely used today for connecting a three-phase motor in a three-phase network. The simplicity of the circuit design and the availability of components are its significant advantages.
Electronic control systems are most common. Switching circuits assembled with thyristors without starters. Although starters can also be installed to turn on or off remotely in this circuit.
They are more complex, but also more reliable, than contactor-based devices. Pulse-phase control systems (PPCS), frequency control systems. They are multifunctional devices, with their help it is possible not only to reverse the asynchronous electric motor, but also to regulate the speed.
At home there is a need to connect the motor 380V to 220V with reversing. For this purpose it is necessary to switch the windings star-delta. In more detail we discussed the differences of these schemes in the article posted on the website earlier: https://samelectrik.ru/to-takoe-zvezda-i-treugolnik-v-elektrodvigatele.html.
However, if you intend to connect a three-phase electric motor to a single-phase network, then a capacitor is used, which is connected according to the scheme below.
To reverse the motor, simply switch the mains lead from B to terminal A, and disconnect the capacitor from A and connect it to terminal B. This is conveniently done with a 6-pole toggle switch. This is a typical connection of an asynchronous electric motor to the network 220V with a capacitor.
The specifics of operation of the angle grinder
The tool is distinguished by its increased functionality. It can be used for surface cleaning. It is necessary to equip the angle grinder with special steel rods and blades of sandpaper. such a circle will act as a cleaner.
- For grinding. the concentric nozzle with Velcro is screwed onto the tool. The latter holds the abrasive. Immediately before starting work, check that the connection works;
- For grinding with abrasive discs. the latter component must be used extremely carefully. Overexertion can cause the abrasive to break.
By installing special cutting discs, the angle grinder can also be used for grinding concrete. Thanks to its multi-functionality, the tool is in high demand for any kind of works.
Speed controller for angle grinder with your own hands
Although the establishment of the speed regulator for the angle grinder few, who is necessary, there are still models that have made manual adjustment of disk speed. The angle grinder regulator is much different from an electric electric screwdriver or drill because:
- A completely different grip is used throughout the work.
- Do not carry out adjustments during operation. Adjustment should only be carried out with the appliance switched off.
Need to adjust the speed of the disc
- When cutting metal (regardless of the thickness of the material), the result of the work performed depends on the speed of the disc. If you are cutting metal of great thickness, then the speed should be the fastest. If you are working with a material that is not very thick, then the speed must be reduced, as a high speed will quickly wash out the disc surface.
- If you cut tiles at high speed, there is a certain danger. Also the disc, rotating at great speed, begins to beat off small pieces of material, thereby making its surface brittle. Since there are different types of stone, a specific speed is used for each type. For many minerals, high speeds are used.
- If grinding or polishing is carried out, then the adjustment of the speed of the angle grinder is simply necessary. If the speed is not set correctly, the surface of the material will be ruined. For example, the material that has a paint coating can be spoiled.
- If discs are constantly used, which have different diameters, then the speed controller for the angle grinder must be available. If you change the angle grinder wheel to a wheel with a larger diameter, the speed must be reduced. You cannot hold a sander with a disc with a large diameter.
- The choice of rotation speed when polishing concrete material is dependent on the use of a particular type of bit. The torque must not be reduced by reducing the rotational speed.
- If you are using a diamond disc, the number of revolutions must be reduced, otherwise the surface due to overheating will begin to fail. Of course, if you use an angle grinder to cut pipes, angles or profiles, then the presence of the regulator is not necessary. But if the angle grinder is used for a variety of purposes, then the speed controller for the angle grinder is a must. All of these reasons show that having an angle grinder regulator is a must.
Angle grinder regulator description
The angle grinder’s regulator is a rheostat (variable resistor) which reduces the voltage (everything is controlled by the regulator). It is necessary to control the amount of current, because a decrease in the number of revolutions will reduce the power of the construction machine. Consequently, the torque will be reduced. As a result, there will be a small value of voltage, and at a certain resistance the electric motor will not be able to turn the shaft. Therefore, it is necessary to follow a certain scheme: The scheme of the angle grinder is made up of a soft starter module and directly the speed regulator.
Modern advanced models have a distinctive electronic system, and not everyone will be able to afford to buy it.
Independent creation of the regulator
How to make the regulator by your own? The desire to attach an ordinary electronic device designed to change the electric power (dimmer) ends up with nothing. First of all, the dimmer for the angle grinder is designed for a different load. Also, the dimmer has no overlap with the control of the electric motor winding. That is why it is necessary to mount a separate circuit. You also need to think about where it will be located inside the body of the angle grinder.
Important point: if you do not have any experience with electrical circuits at all, it is best to buy a ready-made regulator for an angle grinder or an angle grinder with the presence of this function.
A simple semiconductor device (thyristor regulator) can be constructed with your own hands. For this procedure you will need 5 radio elements. You can buy radio elements at a flea market. Due to the compactness, you can safely hold the prepared scheme in the angle grinder, without damaging the ergonomics and reliability. However, the torque is not saved by reducing the speed of the angle grinder. This option is best suited for processing soft metals, as well as tin, which has a small thickness.
If you are working on stone, you must install a disc that is 180 millimeters in size. The next step is to make a more complicated regulator circuit. In this circuit, the control module will be the chip KR1182PM1. This circuit has control over the amperage at different RPMs, and also makes the loss of torque minimal when the RPMs are reduced. When using such a scheme, the operation of the motor is increased.
If the angle grinder is used as a circular grinder, it is necessary to equip the angle grinder with a connection point. Thanks to such a point, the connection is made, and the speed can be adjusted remotely. You have an excellent homemade speed controller.
It does not depend on how you made the regulator, it is a mandatory component of the angle grinder, which makes the possibilities of work wider and allows the comfortable use of this construction tool. Also, after installing the dimmer, it is necessary to conduct a test run of the angle grinder to check: whether the construction tool is not torn out of his hands. You can make an external speed controller for an angle grinder with your own hands.
Reversing angle grinder
Replacing the Power Button on a Cordless Electric Screwdriver
A faulty trigger is a very common failure, because it is subject to systematic action during operation. The device may be subjected to a purely mechanical failure Cracked, cracked, grooved, clogged by dust or dirt. There can be more serious causes.
It is quite possible that an electric screwdriver can be repaired. It is prudent to contact a service center, especially if the tool is under warranty, or to make repairs with your own hands. If a faulty trigger is the cause of the problem, you should disassemble the tool body. We present the further sequence of operations:
- Remove the battery under the decorative cover there are fixing screws that must be unscrewed.
- If the melting of the power transistor is detected, then due to its malfunction, it is impossible to regulate the speed of rotation smoothly, because the power circuit is closed directly to the electric motor. Then the cause of malfunctioning can be found in the button.
- Then you need to make sure that the motor works: disconnect the power from the button and connect the motor to the battery. Turning of the motor also indicates a problem with the button.
- Since different models do not have the same parameters of slots, it is advisable to pick up the button in accordance with the specific type of electric screwdriver.
- To connect a new pushbutton, connect the motor to its terminals, then the battery contacts to the battery respectively.
- Press the key and check the direction of rotation of the electric motor shaft. In this way you can set the reverse switch of the electric screwdriver in the usual position. To change direction of rotation, it is necessary to swap electric motor wires.
- Assemble the body of the cordless electric angle grinder, place the pusher in the groove and connect it to the lever of the button.
- As standard, the button comes with a transistor and battery terminals, respectively, you should carefully and compactly place all the elements and wires inside the housing.
If when you press the button, the electric screwdriver is smoothly engaged in the work, responsive to the force of the press, it is easy to switch in the reverse direction, does not zabuhanka at full power, then the repair is done correctly.
How to cut correctly
First of all, you must hold the tool correctly in your hand. Right-handed people hold the angle grinder with their right hand on the housing. In this case the wheel is on the left and the gearbox is on the right side of the machine. You need to hold the tool with your left hand by the handle screwed into the housing. The correct position of the handle is upwards. The protective guard must cover the blade and hands, throwing sparks away from the worker. For left-handed workers the handle is screwed into the other side of the body and the blade guard is rotated and locked in position.
Tool manufacturers give three main tips for working with an angle grinder: keep a firm grip with your hands, do not be on the cutting line, stop and do not start the machine if the disc is jammed.
How and in what direction to cut everyone decides for himself, taking into account that when jamming the angle grinder tosses in different directions.
Cut away from yourself
This is a very good way, but it is important to observe one condition. cut away from yourself, with sparks under your feet. In this case, when jamming the disc, the angle grinder is thrown out, so it is not able to cause any harm. In this way the marked cutting line is clearly visible and there is very little chance of doing anything wrong. The disadvantage of this method is that sparks fly on your pants and under your feet.
Cut on yourself
This method has a lot of supporters. It is important, however, not to forget that if you pull the angle grinder on yourself, sparks must always fly in the opposite direction. This minimises the risk of the disc jamming. Although it always remains. That’s why it is imperative that the mowing line is kept clear of the cutting line when the tool is pulling toward you.
Hyundai G 750-125 angle grinder
A quality gearbox transmits the maximum torque from the motor without any loss of power. Specially shaped and hardened gears are located in the gearbox for improved durability and long life. Magnesium housing protects the gearbox when it is dropped or hit with hard objects, keeps dust and water droplets from getting inside. In addition, the lightweight housing reduces the weight of the tool.
HANDLE FOR COMFORTABLE GRIP
The additional handle provides more comfort. Two hands are used to hold the tool, which improves the concentration of the user. The operator can change the direction of the cut and the angle of rotation. The special coating of the handle allows a firm grip, which is reflected in the quality of the cut. Extra support provides greater safety for the user.
PROTECTIVE METAL COVER
the angle grinder is equipped with protection for the operator against flying sparks and small particles of material. Metal is not deformed by hot abrasive particles. Large width of the blade tip prevents splinters from escaping in the event of damage as might occur if the blade should jam or kick back. The hood is securely mounted so that it cannot move around by itself.
ERGONOMIC COMPACT DESIGN
The model has a clever design, which is not only pleasant to look at, but also contributes to a long-lasting hold on the tool during prolonged work. Weight of the angle grinder is 1.7 kg. Modest size allows to work in tight spaces. Compact design fits snugly in the palm of the hand, for particularly precise operation. Air vents are provided for ventilation in time.
SPINDLE LOCKING FOR EASY TOOL CHANGE
On the top of the housing is a button to lock the rotation of the wheel. With its help the operator can quickly stop the rotation of the shaft to change the cutting tool. Secure locking prevents not only the spindle but also the attachment from rotating. Quick-change clamping device enables the user to change tooling with one hand and quickly clamp a disc replacement.
Advanced model is designed to work with a 125 mm diameter disc. These discs can be used on all kinds of materials that are commonly found in domestic applications. The density of the materials to be processed directly depends on the quality of the dressing disc. The model is capable of speeds up to 12,000 rpm, which allows you to make accurate cuts in a short period of time with high quality of cut.